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Find the prime factors of each number. Click the link to find the Factor Trees and Prime Factorization Use prime factorization to find the GCF and LCM. Essential Skills Number Properties - identify prime factors Determine whether a given whole number in the range 1-100 is prime or composite. Find common factors and multiples. Find the greatest common factor of two whole numbers less than or equal to 100. Find the least common multiple of two whole numbers less than or equal to 12. Tap the button to explain your thinking!